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Preparation method of waterborne polyurethane adhesive and application in roads reflecting material

A water-based polyurethane and adhesive technology, used in polyurea/polyurethane adhesives, surface pretreatment adhesive methods, adhesive types, etc., can solve the problem of low proportion of polyurethane emulsion and modified monomer dosage. Restriction, poor emulsion stability, etc., to achieve the effect of reducing hidden dangers in production safety, excellent performance, and easier control of operation

Active Publication Date: 2008-10-15
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the synthesis is carried out in two steps; an emulsifier needs to be added during the reaction, and the amount of modified monomers is limited; the resulting emulsion has poor stability.
The disadvantage of this technology is that the product is a blend system with poor stability; the proportion of polyurethane emulsion is low and the performance is limited

Method used

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  • Preparation method of waterborne polyurethane adhesive and application in roads reflecting material
  • Preparation method of waterborne polyurethane adhesive and application in roads reflecting material
  • Preparation method of waterborne polyurethane adhesive and application in roads reflecting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 0.61g of poly-1,4-butylene adipate diol, 33.0g of polyether 330 and 2.2g of DMPA into a three-neck flask, mix and stir, and vacuum dehydrate at 80°C for 1.5h, with a vacuum degree of 0.095MPa. Then add 1.9gNMP (1-methyl-2-pyrrolidone), 0.76gHEA (hydroxyethyl acrylate), 7.54gIPDI and a small amount of catalyst successively, and heat the reaction until the NCO value in the system reaches the theoretical value substantially to obtain a prepolymer, and Start to cool down. Cool the prepolymer to 60°C and dilute it with an appropriate amount of acetone. After the viscosity is reduced, add 1.2 g of triethylamine dropwise under high-speed stirring for shear emulsification, neutralization, and salt formation. Add 163.14g of water after the phase transition is basically completed, then slowly add 0.65g of chain extender ethylenediamine dropwise, and further chain extension and emulsification reaction for about 30 minutes, to obtain a slightly blue white emulsion (theoretical ...

Embodiment 2

[0032] Under the operating conditions of Example 1, the amount of polyadipate-1,4-butylene glycol ester diol was adjusted to 20.85g, polyether 330 was adjusted to 3.0g, DMPA was 2.0g, and IPDI was adjusted to 8.05 gMDI, the amount of water used is 72.43g, and finally a translucent slightly blue PU emulsion (theoretical solid content is 34.66%) is obtained. Among them, hydrophilic monomer accounts for 5%, modified monomer accounts for 2%, isocyanate accounts for 22%, and NCO / OH is 1.00.

Embodiment 3

[0034] Under the operating conditions of Example 1, the hydroxyl component was changed to 15.9g polyether 330 and 5.4g polyether 220, and 1.0g epoxy E-51 was added, the amount of IPDI was 6.5g, and the amount of water was 76.47g. Obtained transparent PU emulsion with blue light (theoretical solid content is 31.59%). Among them, hydrophilic monomer accounts for 7%, modified monomer accounts for 2.4%, isocyanate accounts for 21%, and NCO / OH is 1.07.

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Abstract

The invention relates to the nano-powder preparation field, in particular to a method for preparing nearly spherical nanometer oxide powder having good monodispersity and uniform particle size distribution with ultrasonic atomization. The method is characterized in that: the synthesis of water polyurethane is divided into three stages; a first stage is stepwise polymerization, i.e. polyurethane prepolymer is formed from oligomer polylol, hydrophilic monomers, modified monomers and isocyanate through stepwise polymerization; a second stage is the dispersion of the prepolymer in water after neutralization and salt formation; a third stage is the formation of water polyurethane emulsion after hydrophilic chain extender is added. The invention adopts a route of polymerizing modified monomers and polyurethane monomers jointly with different reaction mechanisms to ensure that modified monomers and polyurethane monomers are interpenetrated or grafted, thus obtained products have multiple material characteristics, i.e. the characteristics of acrylic acid, epoxy, hydroxyl silane and other materials are led into the products at the same time when the advantages of polyurethane material are maintained, so as to ensure that target products have stronger adaptability and better performance.

Description

technical field [0001] The invention relates to an adhesive, in particular to a preparation method of a water-based polyurethane adhesive and its application on road reflective materials. Background technique [0002] Waterborne polyurethane adhesive refers to the adhesive formed by dissolving or dispersing polyurethane in water. [0003] In the 21st century, the importance of environmental protection in people's daily life has become increasingly prominent. Both industrial products and household daily necessities are developing towards an environmentally friendly trend, which provides a broad application prospect for the use of new environmentally friendly materials. Water-based polyurethane adhesives are produced in response to this market demand. [0004] The production of waterborne polyurethane generally includes two main steps: 1. Polymerize oligomer polyols and polyisocyanate compounds to form high molecular weight polyurethane or medium and high molecular weight pol...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J5/02G09F19/22
Inventor 杜郢代飞高山
Owner 溧阳常大技术转移中心有限公司
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